Commits on May 10, 2024

1. Plug leak of "match_args" in StructMeta. …

   "match_args" is set in StructMetaInfo and eventually StructMeta via -
   
   ```
    info->match_args = PyTuple_GetSlice(info->fields, 0, nfields - nkwonly);
   ```
   
   This is incref'd before copying to StructMeta, and decref'd when
   cleaning up StructMetaInfo. There's no corresponding decref for
   StructMeta itself. This causes a leak that valgrind readily detects:
   
   ```
   env PYTHONMALLOC=malloc valgrind python3 -c 'import msgspec'
   ...
   ==576283== LEAK SUMMARY:
   ==576283==    definitely lost: 1,608 bytes in 26 blocks
   ```
   
   With the fix in place, we get:
   
   ```
   ==576086== LEAK SUMMARY:
   ==576086==    definitely lost: 0 bytes in 0 blocks
   ```

   

   peadar committed May 10, 2024
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